Denso Corporation

Toshiya Saito

Hidenori Akita

Makoto Tanaka

Kunihiko Sasaki

Hiroshi Hazumi

Masanobu Yukumatsu

Hideo Matsuki

Yuuji Kamiya

An inter-vehicle communication device that is connected to a wide-area communication terminal determines a dedicated short-range communication resource assignment by using a wide-area communication resource assignment that is assigned to the wide-area communication terminal. Since a plurality of terminals are not assigned to the same resource block in the wide-area communication resource assignment, the dedicated short-range communication resource assignment determined by using the wide-area wireless communication resource assignment can also prevent a plurality of terminals from being assigned to the same time slot. The wide-area communication resource assignment is essentially necessary for the communication between a base station communication device and the terminals. Since the wide-area communication resource assignment which is necessary is used to determine the dedicated short-range communication resource assignment, a limit to the amount of downlink data can be reduced.

Inter-vehicle communication system and inter-vehicle communication device

In a communication control apparatus wirelessly communicable with a plurality of wireless communication units respectively installed in a plurality of vehicles, a first determiner determines at least one wireless communication unit in a number of wireless communication units in the plurality of wireless communication units as a first enabling unit that enables wireless communications with the communication control apparatus if information transmitted from the at least one wireless communication unit is second type information including a piece of vehicle information that includes at least the identifier of the corresponding vehicle. A second determiner determines a wireless communication unit in the remaining one or more wireless communication units as a second enabling unit, which enables wireless communications with the communication control apparatus, if information transmitted from the wireless communication unit is not included in the information transmitted from the first enabling unit.

Communication control system with ad hoc wireless communication function

A communication device for acquiring a traffic information includes: a communicating element; a request message transmitting element for transmitting a request message, which includes a request vehicle identification information, a target zone information and an information for specifying the traffic information; a request message receiving element for receiving the request message; a request message transferring element for transferring the request message; a response message transmitting element for transmitting a response message when the automotive vehicle is disposed in the target zone and when the traffic information is capable of retrieving; a response message receiving element for receiving the response message; a response message transferring element for transferring the response message when a vehicle is not a request vehicle; and an outputting element for outputting the traffic information when the vehicle is the request vehicle.

Communication device for automotive vehicle

A multibeam antenna for forming multiple beams includes an antenna array and a Butler-matrix feeder circuit. The antenna array is composed of 2,main antenna elements and a group of 2,or less auxiliary antenna elements placed at either one or both sides of the main antenna elements. Antenna power is supplied to the antenna array from the Butler-matrix feeder circuit and is distributed to all the antenna elements with higher power to the elements located in the middle of the array and lower power to the elements located at sides of the array. Phase of the power supplied to the main antenna elements is shifted by 180-degree, and the phase-shifted power is distributed to predetermined auxiliary antenna elements. Thus, sidelobes associated with antenna beams are reduced and the beam directivity is improved.

Multibeam antenna having auxiliary antenna elements

A planar array antenna comprises a plurality of antenna elements disposed in a predetermined matrix pattern. Feeders extend from a feed to the antenna elements. High-frequency switches cooperatively open or close the feeders connected to antenna elements of at least one row of the matrix pattern located at both a right-end and a left-end regions of an antenna surface. Switching signals are supplied to the high-frequency switches from switching terminals for alternately activating the associated antenna elements, thereby providing two time-divisional array antennas offset in position by a distance corresponding to the width of at least one row of the antenna elements controlled.

Growing community of inventors

Hekinan, Japan

Toshiya Saito